This is a big antenna which is placed in Puerto Rico ,in the purpose of listening/capturing radio signals which are released from far reaches of space.(beyond our solar system)
Hoping for an massage from another technologically mature extraterrestrial life form.
Antenna uses parabolic reflection to collect radio signals.
The pictures here shows the image of the Arecibo Observatory Antenna.
* It is the largest anntena on earth.
*The huge "dish" is 305 m (1000 feet) in diameter, 167 feet deep, and covers an area of about twenty acres.
*world's most sensitive radio telescope.